Collabora fullscreen presentation not loading

Nextcloud version (eg, 20.0.5): 28.0.1
Operating system and version (eg, Ubuntu 20.04): Debian 12
Apache or nginx version (eg, Apache 2.4.25): nginx 1.22.1-9
PHP version (eg, 7.4): (I assume 8.1? using the AIO v7.9.1)

The issue you are facing: When opening a .odp file in the aio-supplied collabora server and I want to start the presentation, the full-screen loading screen never disappears. When exiting full screen, I get a error message telling me there was a failure with “saveas”.

Is this the first time you’ve seen this error? (Y/N): N

Steps to replicate it:

  1. Create a .odp with a supplied template
  2. Hit “Present” button to open it fullscreen
  3. Exit fullscreen as it isn’t loading.

The output of the collabora server log from aio that appears for each time I open the document and hit present:

sh: 1: /usr/bin/coolmount: Operation not permitted
sh: 1: /usr/bin/coolmount: Operation not permitted
sh: 1: /usr/bin/coolmount: Operation not permitted
wsd-00007-00016 2024-01-18 20:55:23.218045 +0100 [ websrv_poll ] WRN  convert-to: Requesting address is denied: ***MYCLIENTIPHERE***| wsd/COOLWSD.cpp:4095
frk-00011-00011 2024-01-18 20:55:32.993863 +0100 [ forkit ] WRN  The systemplate directory [/opt/cool/systemplate] is read-only, and at least [/opt/cool/systemplate//etc/hosts] is out-of-date. Will have to copy sysTemplate to jails. To restore optimal performance, make sure the files in [/opt/cool/systemplate/etc] are up-to-date.| common/JailUtil.cpp:529
kit-45854-00011 2024-01-18 20:55:37.079505 +0100 [ kitbroker_006 ] ERR  ToMaster-18ab: SaveAs Failed for id=slideshow [/tmp/user/docs/LChO6Y01trUvOx5MNAOgLtBPZr5r9lC6R4T5zXDfxXTo2lT4uZWa9Ikl6VGkGPZZ/slideshow.svg]. error= exception: SfxBaseModel::impl_store <file:///tmp/user/docs/LChO6Y01trUvOx5MNAOgLtBPZr5r9lC6R4T5zXDfxXTo2lT4uZWa9Ikl6VGkGPZZ/slideshow.svg> failed: 0xc10(Error Area:Io Class:Write Code:16) at /opt/collaboraoffice/debugsource/sfx2/source/doc/sfxbasemodel.cxx:3249 at /opt/collaboraoffice/debugsource/sfx2/source/doc/sfxbasemodel.cxx:1807| kit/ChildSession.cpp:1111
kit-45854-00011 2024-01-18 20:55:37.079535 +0100 [ kitbroker_006 ] ERR  ToMaster-18ab: error: cmd=downloadas kind=saveasfailed| common/Session.hpp:169
wsd-00007-47668 2024-01-18 20:55:37.079636 +0100 [ docbroker_006 ] ERR  ToClient-18ab: downloadas error failure: saveasfailed| wsd/ClientSession.cpp:1686
kit-45854-00011 2024-01-18 20:55:37.080713 +0100 [ kitbroker_006 ] ERR  ToMaster-18ab: error: cmd=exportas kind=failure| common/Session.hpp:169
wsd-00007-47668 2024-01-18 20:55:37.080860 +0100 [ docbroker_006 ] ERR  ToClient-18ab: exportas error failure: failure| wsd/ClientSession.cpp:1686

I don’t know what the first WRN message about my IP is about… it does not seem related to the WOPI request allow list as modifying that does not have any effect.